Cummins 2nd gen swap guide (Everything you need to know)
What is a Cummins 2nd gen swap?
A Cummins 2nd gen swap is one of the most popular upgrades for 5.9 Cummins engines. It involves converting your turbo setup to a 2nd generation style configuration, allowing for better airflow, improved turbo placement, and increased performance.
This setup is commonly used on both 12v and 24v Cummins engines and is ideal for trucks looking to gain horsepower, reliability, and a cleaner engine bay layout.
Benefits of a 2nd gen swap:
- Improved airflow and turbo efficiency
- Better spool and throttle response
- Easier turbo upgrades (S300, S400)
- Cleaner and more accessible engine bay
- Eliminates restrictive factory turbo setups
What do you need for a 2g swap?
A complete Cummins 2nd gen swap kit typically includes:
- T3 or T4 exhaust manifold
- Turbo piping and intercooler connections
- Oil feed and drain lines
- Mounting hardware and fittings
Choosing the right turbo for your build:
Most Cummins 2g swap setups run S300 or S400 based turbos depending on horsepower goals. Smaller turbos offer quicker spool, while larger turbos provide higher top-end power.
Why choose Mayo Fab?
Mayo Fab builds high-quality Cummins 2nd gen swap kits designed for perfect fitment and real-world performance. Built in East Tennessee, our kits are trusted by diesel enthusiasts who demand reliability and performance.
👉 Shop our Cummins 2nd gen swap kit here:
Cummins 2nd gen swap kit | s400 & g45 compatible | Mayo Fab| Mayofab
Common searches: Cummins 2nd gen swap, 2g swap Cummins, 5.9 Cummins turbo swap, 12v 2nd gen swap, 24v 2g swap.